1
The reference modern diver chronograph.
Tudor Black Bay Chrono: Cal. MT5813 (column-wheel, vertical clutch), 70-hour reserve, COSC. 200m water resistance. The most-recommended diver chrono.
Why diver chronographs are hard
A standard chronograph has external pushers; pressing a pusher under water risks breaching the case seal. Diver chronographs solve this with screw-down pushers (must unscrew before use), internal pusher gaskets, or simply increasing seal redundancy. The result is a more complex case construction at higher cost.
Most modern divers don't need chronograph functionality (a rotating bezel times a dive perfectly well), so the genre is half-functional, half-statement-of-engineering-flex. Buyers who want both, or who appreciate the case engineering, pay the premium.
2
True 1,000m saturation diver chrono.
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Breitling SuperOcean Chronograph: 1,000m water resistance, B01 in-house chronograph, screw-down pushers. The most legitimate saturation-rated diver chrono.
3
Master Chronometer chrono.
Omega Seamaster Diver 300M Chronograph: Cal. 9900 Master Chronometer co-axial, 300m water resistance. Chronograph pushers screw down for diving.
4
Cousteau-orange diver chronograph.
Doxa Sub 200 T-Graph: orange diver dial, ETA 7750 chronograph, 200m water resistance. The heritage answer.
5
Internal/external dual-bezel chronograph.
IWC Aquatimer Chronograph: internal rotating bezel set via external bezel ring, Cal. 89365 in-house, 300m water resistance.
6
German tool diver chronograph.
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Sinn 203 Arctic: 1,000m water resistance, Tegimented case, dehumidifying technology, Valjoux 7750 base. Designed for deep-cold environments.
7
British-assembled diver chronograph.
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Bremont Supermarine chronograph variant: 500m water resistance, Trip-Tick three-piece case construction, COSC ETA 7753 base.
8
€500 Eco-Drive diver chronograph.
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Citizen Promaster Diver Chronograph: Eco-Drive solar quartz chronograph, 200m water resistance. The cheapest legitimate diver chronograph.
9
€800 Swiss diver chronograph.
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Tissot Seastar 1000 Chronograph: 300m water resistance, ETA G10.211 quartz chronograph. The under-€1k Swiss option.
10
Longines's diver chrono.
Longines HydroConquest Chronograph: ETA-based L688 chronograph, 300m water resistance, ceramic bezel insert.
Honourable mentions
Blancpain Bathyscaphe Chronographe Flyback · 5200Higher-tier diver chrono at ~€19k.
Rolex Yacht-Master II · 116681Regatta countdown rather than chronograph; ~€20k.
TAG Heuer Aquaracer Professional 300 Chrono · CBP2110TAG's diver chrono at ~€4,100.
How to choose
Best one to own: Tudor Black Bay Chrono. Best saturation-grade: Breitling SuperOcean Chronograph 1,000m. Best heritage: Doxa Sub 200 T-Graph. Best value: Citizen Promaster Diver Chronograph at €500.